---
id: CVE-2026-88002
title: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform
summary: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform. From 0.5.0 until 0.11.1, the message-chain reconstruction helper in
  backend/open_webui/utils/misc.py advanced through a chat history by map key
  but tra…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-835
vendor: openwebui
product: open_webui
affected:
  - 'open_webui >= 0.5.0, < 0.11.1'
patched:
  - open_webui 0.11.1
published: '2026-09-09'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:56:27.077'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88002'
references:
  - url: >-
      https://github.com/open-webui/open-webui/commit/5c79ccc9e5c9efc2bc024d8f0b9757652ece929a
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/pull/28034'
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/releases/tag/v0.11.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-jqhh-cjmq-vmv6
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00583
epssPercentile: 0.45486
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T17:12:17.083962Z'
ingestedAt: '2026-09-13T02:42:38.805Z'
---

## Overview

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.1, the message-chain reconstruction helper in backend/open_webui/utils/misc.py advanced through a chat history by map key but tracked visited entries using each message body's optional id field. An authenticated user could store id-less messages in a parent cycle and trigger a non-terminating walk that blocked the async event loop, grew memory until termination, and remained persistent across process restarts. This issue is fixed in version 0.11.1.

## Affected

- `open_webui >= 0.5.0, < 0.11.1`

## Remediation

Upgrade past the affected range:

- `open_webui 0.11.1`